<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - trackball controls</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<link type="text/css" rel="stylesheet" href="main.css">
		<style>
			body {
				background-color: #ccc;
				color: #000;
			}
			a {
				color: #f00;
			}
		</style>
	</head>

	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - trackball controls<br />
			MOVE mouse &amp; press LEFT/A: rotate, MIDDLE/S: zoom, RIGHT/D: pan
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';
			import { GUI } from './jsm/libs/dat.gui.module.js';

			import { TrackballControls } from './jsm/controls/TrackballControls.js';

			let perspectiveCamera, orthographicCamera, controls, scene, renderer, stats;

			const params = {
				orthographicCamera: false
			};

			const frustumSize = 400;

			init();
			animate();

			function init() {

				const aspect = window.innerWidth / window.innerHeight;

				perspectiveCamera = new THREE.PerspectiveCamera( 60, aspect, 1, 1000 );
				perspectiveCamera.position.z = 500;

				orthographicCamera = new THREE.OrthographicCamera( frustumSize * aspect / - 2, frustumSize * aspect / 2, frustumSize / 2, frustumSize / - 2, 1, 1000 );
				orthographicCamera.position.z = 500;

				// world

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xcccccc );
				scene.fog = new THREE.FogExp2( 0xcccccc, 0.002 );

				const geometry = new THREE.CylinderGeometry( 0, 10, 30, 4, 1 );
				const material = new THREE.MeshPhongMaterial( { color: 0xffffff, flatShading: true } );

				for ( let i = 0; i < 500; i ++ ) {

					const mesh = new THREE.Mesh( geometry, material );
					mesh.position.x = ( Math.random() - 0.5 ) * 1000;
					mesh.position.y = ( Math.random() - 0.5 ) * 1000;
					mesh.position.z = ( Math.random() - 0.5 ) * 1000;
					mesh.updateMatrix();
					mesh.matrixAutoUpdate = false;
					scene.add( mesh );

				}

				// lights

				const dirLight1 = new THREE.DirectionalLight( 0xffffff );
				dirLight1.position.set( 1, 1, 1 );
				scene.add( dirLight1 );

				const dirLight2 = new THREE.DirectionalLight( 0x002288 );
				dirLight2.position.set( - 1, - 1, - 1 );
				scene.add( dirLight2 );

				const ambientLight = new THREE.AmbientLight( 0x222222 );
				scene.add( ambientLight );

				// renderer

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

				stats = new Stats();
				document.body.appendChild( stats.dom );

				//

				const gui = new GUI();
				gui.add( params, 'orthographicCamera' ).name( 'use orthographic' ).onChange( function ( value ) {

					controls.dispose();

					createControls( value ? orthographicCamera : perspectiveCamera );

				} );

				//

				window.addEventListener( 'resize', onWindowResize );

				createControls( perspectiveCamera );

			}

			function createControls( camera ) {

				controls = new TrackballControls( camera, renderer.domElement );

				controls.rotateSpeed = 1.0;
				controls.zoomSpeed = 1.2;
				controls.panSpeed = 0.8;

				controls.keys = [ 'KeyA', 'KeyS', 'KeyD' ];

			}

			function onWindowResize() {

				const aspect = window.innerWidth / window.innerHeight;

				perspectiveCamera.aspect = aspect;
				perspectiveCamera.updateProjectionMatrix();

				orthographicCamera.left = - frustumSize * aspect / 2;
				orthographicCamera.right = frustumSize * aspect / 2;
				orthographicCamera.top = frustumSize / 2;
				orthographicCamera.bottom = - frustumSize / 2;
				orthographicCamera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

				controls.handleResize();

			}

			function animate() {

				requestAnimationFrame( animate );

				controls.update();

				stats.update();

				render();

			}

			function render() {

				const camera = ( params.orthographicCamera ) ? orthographicCamera : perspectiveCamera;

				renderer.render( scene, camera );

			}


		</script>

	</body>
</html>
